221122012121 has 8 divisors (see below), whose sum is σ = 232497359424. Its totient is φ = 209893443760.

The previous prime is 221122012109. The next prime is 221122012129. The reversal of 221122012121 is 121210221122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221122012121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221122012121.

It is not an unprimeable number, because it can be changed into a prime (221122012129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36691646 + ... + 36697671.

It is an arithmetic number, because the mean of its divisors is an integer number (29062169928).

Almost surely, 2^221122012121 is an apocalyptic number.

It is an amenable number.

221122012121 is a deficient number, since it is larger than the sum of its proper divisors (11375347303).

221122012121 is a wasteful number, since it uses less digits than its factorization.

221122012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73389471.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221122012121 its reverse (121210221122), we get a palindrome (342332233243).

The spelling of 221122012121 in words is "two hundred twenty-one billion, one hundred twenty-two million, twelve thousand, one hundred twenty-one".